U.S. President Joe Biden is expected to hold a crucial phone call on Wednesday morning with Israeli Prime Minister Benjamin Netanyahu about Israel's plans to strike Iran, three U.S. officials told U.S. news portal Axios.

The call would be the first between Biden and Netanyahu in two tense months, and comes as Israel considers major attacks that could significantly escalate its regional war.

British Foreign Secretary David Lammy warned on Wednesday that countries "must not waver" as they work towards ceasefires in Gaza and Lebanon, as he visited two regional allies.

Lammy, who will hold talks with leaders in Bahrain and Jordan and meet UK armed forces personnel currently stationed in the Middle East, called the situation there "incredibly dangerous."

Palestinian officials say Israeli strikes in central and northern Gaza killed at least 18 people, including five children and two women.

Two strikes hit tents for displaced people in the urban Nuseirat and Bureij refugee camps in central Gaza early Wednesday. The bodies of nine people, including three children, were brought to the Al-Aqsa Martyrs Hospital in the nearby town of Deir al-Balah. An Associated Press journalist saw the bodies at the morgue.

Israeli Defense Minister Yoav Gallant has postponed a trip to the United States scheduled for this week, delaying a planned meeting with his U.S. counterpart Lloyd Austin, the Pentagon said.

A war monitor said four people, including two non-Syrians, were killed in an Israeli air strike Tuesday targeting a building in the Syrian capital used by Iran's Revolutionary Guards for meetings with Hezbollah.

"Israel targeted a building frequented by senior Revolutionary Guards and Hezbollah operatives, as well as a car parked in front of the building... killing four people," the Britain-based Syrian Observatory for Human Rights said.

Palestinians say heavy fighting is underway in northern Gaza, where Israel has ordered another wholesale evacuation and launched a ground operation a year into the war with Hamas.

At least 15 people, including two women and four children, were killed Tuesday in the fighting in Jabaliya, the nearby Kamal Adwan Hospital said.

The Biden administration has in recent weeks grown “increasingly distrustful” of what the Israeli government says about its military and diplomatic plans in the multi-front war it is fighting, four U.S. officials told U.S. news portal Axios.

Israeli Prime Minister Benjamin Netanyahu said Monday that Israel was fighting a “war of resurrection” and would continue until achieving its goals, as Israelis marked the anniversary of the Hamas attack.

“This is the war of our existence — the ‘war of resurrection’. This is what I would like to officially call the war,” Netanyahu said during a Cabinet meeting.

The war in Gaza was always personal for many Palestinian refugees in Lebanon.

Israel launched a new air and ground offensive in northern Gaza Sunday, hours after pounding Beirut's southern suburbs in the heaviest bombardment since it stepped up its pursuit of Hezbollah last month.

The intensified campaign on two fronts, including an overnight strike on a Gaza mosque that killed 19, came as Israel remained on high alert ahead of memorial events to mark the surprise attack a year ago that triggered the ongoing war.